ICE in int_mode_for_mode, at stor-layout.c:490

[Bernhard Rosenkraenzer]

Using linaro gcc 4.6-2011.10 to build the attached preprocessed source with
-O -march=armv7-a -mfloat-abi=softfp -mfpu=neon -mtune=cortex-a8 -fmodulo-sched -fmodulo-sched-allow-regmoves

results in

[bero@matterhorn iMX53]$ /opt/android-toolchain-eabi/bin/arm-eabi-g++ -o test.o -c matrix.i -O -march=armv7-a -mfloat-abi=softfp -mfpu=neon -mtune=cortex-a8 -fmodulo-sched -fmodulo-sched-allow-regmoves
frameworks/base/opengl/libagl/matrix.cpp: In function 'void android::invert(GLfloat*, const GLfloat*)':
frameworks/base/opengl/libagl/matrix.cpp:584:1: internal compiler error: in int_mode_for_mode, at stor-layout.c:490

It works with -mtune=cortex-a9 or when omitting the modulo-sched options.

Will reduce the test case when I have some time, unless someone beats me to it.

[Michael Hope (michaelh1)]

Thank you for the bug report. I've confirmed this with gcc-linaro-4.6-2011.10 on ARM:

michaelh@ursa2:~/linaro/bugs$ /tools/toolchains/arch/armv7l/gcc-linaro-4.6-2011.10-armv7l-natty-cbuild186-ursa3-cortexa9r1/bin/g++ -O2 -mcpu=cortex-a8 -fmodulo-sched -fmodulo-sched-allow-regmoves -c matrix.i
frameworks/base/opengl/libagl/matrix.cpp: In function 'void android::invert(GLfloat*, const GLfloat*)':
frameworks/base/opengl/libagl/matrix.cpp:584:1: internal compiler error: in int_mode_for_mode, at stor-layout.c:490

As noted in the report, the work-arounds are to build for A9 or to disable SMS. The fault does not exist in gcc-linaro-4.6-2011.09, gcc-4.5.3, gcc-4.6.1, or a recent-ish gcc trunk r178624.

I've set it to medium priority as it is a ftbfs, occurs at high optimisation levels, and was introduced or exposed through our changes.

[Revital Eres (eres)]

Thanks for reporting on this. A patch was submitted to gcc-patches@ http://gcc.gnu.org/ml/gcc-patches/2011-12/msg01459.html

[Bernhard Rosenkraenzer (berolinux)]

Bug still present in 4.6-11.12 - please backport the patch for the 12.01 release.

[Michael Hope (michaelh1)]

@Bernhard: I'll check the patch and see if it's been OK'ed. Are you building Android with SMS turned on?

[Ulrich Weigand (uweigand)]

Fix checked in - will be in 12.02 release (too late for 12.01).